Validation of thigh-based accelerometer estimates of postural allocation in 5-12 year-olds.
van, Loo Christiana MT
Okely, Anthony D
Batterham, Marijka J
Reilly, John J
Jones, Rachel A
Cliff, Dylan P
Journal of science and medicine in sport
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van, L. C. M., Okely, A. D., Batterham, M. J., Hinkley, T., Ekelund, U., Brage, S., Reilly, J. J., et al. (2017). Validation of thigh-based accelerometer estimates of postural allocation in 5-12 year-olds.. Journal of science and medicine in sport, 20 273-277. https://doi.org/10.1016/j.jsams.2016.08.008
OBJECTIVES: To validate activPAL3™ (AP3) for classifying postural allocation, estimating time spent in postures and examining the number of breaks in sedentary behaviour (SB) in 5-12 year-olds. DESIGN: Laboratory-based validation study. METHODS: Fifty-seven children completed 15 sedentary, light- and moderate-to-vigorous intensity activities. Direct observation (DO) was used as the criterion measure. The accuracy of AP3 was examined using a confusion matrix, equivalence testing, Bland-Altman procedures and a paired t-test for 5-8y and 9-12y. RESULTS: Sensitivity of AP3 was 86.8%, 82.5% and 85.3% for sitting/lying, standing, and stepping, respectively, in 5-8y and 95.3%, 81.5% and 85.1%, respectively, in 9-12y. Time estimates of AP3 were equivalent to DO for sitting/lying in 9-12y and stepping in all ages, but not for sitting/lying in 5-12y and standing in all ages. Underestimation of sitting/lying time was smaller in 9-12y (1.4%, limits of agreement [LoA]: -13.8 to 11.1%) compared to 5-8y (12.6%, LoA: -39.8 to 14.7%). Underestimation for stepping time was small (5-8y: 6.5%, LoA: -18.3 to 5.3%; 9-12y: 7.6%, LoA: -16.8 to 1.6%). Considerable overestimation was found for standing (5-8y: 36.8%, LoA: -16.3 to 89.8%; 9-12y: 19.3%, LoA: -1.6 to 36.9%). SB breaks were significantly overestimated (5-8y: 53.2%, 9-12y: 28.3%, p<0.001). CONCLUSIONS: AP3 showed acceptable accuracy for classifying postures, however estimates of time spent standing were consistently overestimated and individual error was considerable. Estimates of sitting/lying were more accurate for 9-12y. Stepping time was accurately estimated for all ages. SB breaks were significantly overestimated, although the absolute difference was larger in 5-8y. Surveillance applications of AP3 would be acceptable, however, individual level applications might be less accurate.
National Heart Foundation of Australia (Grant ID: G11S5975), Australian Research Council (Discovery Early Career Researcher Award (Grant ID: DE140101588)), National Heart Foundation of Australia (Career Development Fellowship (Grant ID: CR11S 6099)), National Health and Medical Research Council (Early Career Fellowship (APP1070571)), Medical Research Council (Grant ID: MCUU 12015/3)
External DOI: https://doi.org/10.1016/j.jsams.2016.08.008
This record's URL: https://www.repository.cam.ac.uk/handle/1810/260800
Attribution 4.0 International, Attribution 4.0 International, Attribution 4.0 International, Attribution 4.0 International